If you use machinery parts downloaded from GTAC, I suggest you to use the machinery library installation tool to import into Teamcenter.
To do this you mus be infodba user and done into the main server.
If you use your parts, remember you have to set correctly the customer default and add or move the part present in the teamcenter in the folder indicated into the customer default, then with right access (we use special user to adminstrate reuse library parts), you can do RMB in the reuse library on the part and then create the .krx file.
Anyway I suggest you to read the word document present in the folders where machinery library installation tool is present.
Thank you...
Using NX 8 and TC9.1